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3x+21=8x-4
We move all terms to the left:
3x+21-(8x-4)=0
We get rid of parentheses
3x-8x+4+21=0
We add all the numbers together, and all the variables
-5x+25=0
We move all terms containing x to the left, all other terms to the right
-5x=-25
x=-25/-5
x=+5
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